Re: [Xenomai] Xeno3.x xeno-config --kcflags

[Philippe Gerum <rpm@xenomai.org>]

On 04/22/2015 08:29 AM, Philippe Gerum wrote:
> On 04/22/2015 08:14 AM, Hänel-Baas, Alexander wrote:
>> Hi Jan
>>
>> You are right, kbuild resolve it.
>>
>> My mistake: I stored the kcflags in a variable and put this variable in the EXTRA_CFLAGS from the make file.
>> XENOMAI_K_CFLAGS  = $(shell /usr/xenomai/bin/xeno-config --rtdm --kcflags)
>> EXTRA_CFLAGS += $(XENOMAI_K_CFLAGS)
>> The result was: EXTRA_CFLAGS= -Iarch/$(SRCARCH)/xenomai/include.
>>
>> So I need a second expand step from $(SRCARCH).
>> My solution is the eval function:
>> $(eval EXTRA_CFLAGS += $(XENOMAI_K_CFLAGS))
>> And now I get:  EXTRA_CFLAGS= -Iarch/arm/xenomai/include 
>> and now module builds are success full.
>>
>> Thank you very much for your post.
>>
> 
> Actually, this xeno-config --kcflags I came up with is overly and
> uselessly complex. Since we patch the build system for merging the
> Xenomai bits into the kernel image, we could just define a plain make
> variable for holding those extra flags, which depend on the file layout
> of the Xenomai release patched in only, so running a script to get them
> is 100% overkill.
> 
> I'll come up with something simpler in the next days, so that Makefiles
> can just refer to $(RTDM_CFLAGS) or something along these lines.
> 

You won't need any extra CFLAGS anymore for building RTDM drivers, with
this commit from the -next branch:

http://git.xenomai.org/xenomai-3.git/commit/?h=next&id=a3a30499b7ffd9a36c18d909909b4f45bf3f710a

For these changes to take effect, you will have to run the
prepare-kernel.sh script on a fresh kernel, so that the kernel Makefiles
are patched properly.

In other words, with this changes in, you can drop the xeno-config
--kcflags invocation from your Makefiles building RTDM drivers.

-- 
Philippe.